The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1992
Filed:
Jul. 18, 1990
Steven G Petermann, Plano, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
Seismic signals are generated in an earth formation at a selected point in a wellbore by apparatus insertable in the wellbore at the distal end of a tubing string. The apparatus is adapted to receive hydraulic pressure fluid from the tubing string for deploying contactor pads in engagement with the wellbore wall and for transmitting seismic signals through the pads to the earth formation. In one embodiment a hydraulic piston is directly connected to linkage for the contactor pads and an oscillatory signal is imposed on the piston for generating vibratory seismic signals. In a second embodiment, a compressed gas-driven impactor is moved to and held in a cocked position by a hydraulically-actuated setting and latching mechanism. Hydraulic control valves and electrical operating circuits are disposed on the apparatus and may be controlled from the surface by way of a wireline cable extending through the tubing string.